Both Antiquity and Modern tend to be exactly three cities.Thanks for all the great tricks and guides in this thread. How many settlements do you normally convert to cities in antiquity, exploration and modern after patch 1.3.0 when going for a speed science victory?
Exploration is in theory "as many as you can get". In practice, I usually end up in the 4-6 range, and I've gotten 40-turn Exploration with both the low and high end of that. The highest priorities for spending gold in Exploration are Settlers and warehouses, and that doesn't always leave much left over for developing cities.
. If you look at the bottom left minimap, you will see that the whole map is explored, every tile. I discovered by chance that if a growth event pushes your Tehina to the land, it will remain there. From there it was just a matter of ensuring that the Tehina was not killed and that it did not embark again.